Memory Die Contact Alignment to Reduce Wire Shorting
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Solution Overview
Problem
Existing memory devices face challenges in improving memory cell density, read/write speeds, operational latency, reliability, data retention, power consumption, and reducing size and manufacturing costs, while maintaining signal integrity and preventing wire shorting.
Innovation Solution
The implementation of memory devices with aligned front-end and back-end interface contacts, where first front-end contacts are aligned with corresponding first back-end contacts, and second front-end contacts are misaligned with second back-end contacts, to reduce wire shorting and enhance signal integrity through specific bonding wire configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If front-end contacts and back-end contacts are misaligned in existing memory devices, then manufacturing is simpler, but wire shorting occurs and signal integrity deteriorates
Solution Approach 1:
The patent applies asymmetry by intentionally misaligning second front-end contacts with second back-end contacts, while maintaining alignment of first front-end contacts with first back-end contacts. This asymmetric contact arrangement optimizes wire bonding paths to prevent shorting while improving signal integrity for critical connections.
Solution Approach 2:
The patent utilizes the vertical dimension by stacking multiple memory dies with aligned contact interfaces. The front-end and back-end contacts are positioned at opposite surfaces of each die, enabling vertical wire bonding paths that reduce horizontal routing complexity and prevent wire shorting through dimensional separation.
2Reliability
If bond wire length is reduced, then inductance decreases and signal integrity improves, but contact alignment precision requirements increase
Solution Approach 1:
The patent implements preliminary action by pre-aligning first front-end contacts with first back-end contacts during die stacking preparation. This pre-alignment ensures that subsequent wire bonding operations can use minimal wire length without requiring high-precision alignment during the bonding process itself, thereby reducing inductance while maintaining manufacturability.
3Reliability
If wire bonding configuration is optimized to prevent shorting, then reliability improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the wire bonding configuration into distinct groups: aligned first contacts with their dedicated wires, and misaligned second contacts with their separate wiring paths. This segmentation prevents wire shorting by ensuring spatial separation of bonding paths while maintaining manageable complexity through systematic organization of different contact groups.
Data Source
AI summary
Semiconductor devices, such as memory devices, and associated systems and methods, are disclosed herein. A representative memory device includes a substrate including circuitry, back-end contacts electrically coupled to the circuitry, and front-end contacts. The front-end contacts are configured to receive electrical signals from an external device via a front-end interface. Individual ones of the front-end contacts are electrically coupled to and aligned along an axis with corresponding ones of the back-end contacts.